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Property, Plant and Equipment, Net - Additional Information (Detail)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2014
CNY
Dec. 31, 2013
CNY
Dec. 31, 2012
CNY
Property, Plant and Equipment [Abstract]        
Depreciation of property, plant and equipment $ 28,206us-gaap_Depreciation 175,008us-gaap_Depreciation 149,975us-gaap_Depreciation 119,919us-gaap_Depreciation
Property and equipment pledged as collateral 26,583us-gaap_DebtInstrumentCollateralAmount 164,938us-gaap_DebtInstrumentCollateralAmount 502,575us-gaap_DebtInstrumentCollateralAmount  
Secured bank borrowings 26,301us-gaap_SecuredLongTermDebt 163,185us-gaap_SecuredLongTermDebt 254,308us-gaap_SecuredLongTermDebt  
Equipment under operating lease, cost 171,978us-gaap_PropertySubjectToOrAvailableForOperatingLeaseGross 1,067,057us-gaap_PropertySubjectToOrAvailableForOperatingLeaseGross 1,113,934us-gaap_PropertySubjectToOrAvailableForOperatingLeaseGross  
Equipment under operating lease, accumulated depreciation $ 56,011us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation 347,524us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation 305,165us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation